chore(server): add detail for error (#13151)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Error messages for unavailable copilot providers now include specific
model IDs for clearer context.
* Added new detailed error messages for embedding generation failures
specifying provider and error details.
* The API and GraphQL schema have been extended with new error types
reflecting these detailed error cases.

* **Bug Fixes**
* Enhanced error handling to detect and report incomplete or missing
embeddings from providers.
* Added safeguards to skip embedding insertions when no embeddings are
provided, preventing unnecessary processing.

* **Documentation**
* Updated localization and translation keys to support dynamic error
messages with model IDs and provider details.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/base/error/def.ts

@@ -653,12 +653,19 @@ export const USER_FRIENDLY_ERRORS = {
   },
   no_copilot_provider_available: {
     type: 'internal_server_error',
-    message: `No copilot provider available.`,
+    args: { modelId: 'string' },
+    message: ({ modelId }) => `No copilot provider available: ${modelId}`,
   },
   copilot_failed_to_generate_text: {
     type: 'internal_server_error',
     message: `Failed to generate text.`,
   },
+  copilot_failed_to_generate_embedding: {
+    type: 'internal_server_error',
+    args: { provider: 'string', message: 'string' },
+    message: ({ provider, message }) =>
+      `Failed to generate embedding with ${provider}: ${message}`,
+  },
   copilot_failed_to_create_message: {
     type: 'internal_server_error',
     message: `Failed to create chat message.`,